Specifications

How to Control the Implementation of VHDL
D-4 VHDL Reference Manual
Detailed Design Dot Extensions
Table C-3 shows the dot extensions that are used to describe different
register types. The required dot extensions are indicated with a check
in the Extension Required column.
Table C-3: Dot Extensions for Device-specific (detailed) Designs
Register Type
Extensi
on
Requir
ed
Support
ed
Extensio
ns
Definition
combinational
(no register)
.oe
.pin
.com
output enable
pin feedback
combinational feedback
D-type flip-flop
ü
ü
.clk
.d
.fc
.oe
.q
.sp
.sr
.ap
.ar
.pin
clock
data input
flip-flop mode control
output enable
flip-flop feedback
synchronous preset
synchronous reset
asynchronous preset
asynchronous reset
pin
JK-type flip-
flop
ü
ü
ü
.clk
.j
.k
.fc
.oe
.q
.sp
.sr
.ap
.ar
.pin
clock
j input
k input
flip-flop mode control
output enable
flip-flop feedback
synchronous preset
synchronous reset
asynchronous preset
asynchronous reset
pin feedback
SR-type flip-
flop
ü
ü
ü
.clk
.s
.r
.oe
.q
.sp
.sr
.ap
.ar
.pin
clock
set input
reset input
output enable
flip-flop feedback
synchronous preset
synchronous reset
asynchronous preset
asynchronous preset
pin feedback